After the fertilized eggs are swollen by water for 1 hour, they can be placed in hatching tanks or hatching tanks for hatching. When fertilized with plastic barrels, there are 50,000 to 100,000 fertilized eggs per barrel.
When the temperature of fertilized egg hatching reached 100°C, a certain number of eggs were placed in the discriminating solution. After 5 minutes, the eggs of the white stripe-shaped embryo body could be seen as the fertilized egg development state. The preparation of the differential solution was 5 ml of formalin, 6 ml of glycerol, 4 ml of glacial acetic acid, and 85 ml of distilled water.
From the timing, the fertilized eggs go through the half-month period to the eye-opening period. After about half a month, the larvae can be hatched. When the average water temperature is 10°C, the incubation period is about 30 days. The number of days from the fertilized egg to the ovum is approximately half the number of days required for hatching.
Incubation was divided into six stages: formation stage of blastoderm, cleavage stage, emergence stage of embryonic ring and embryo shield, somatic segmentation stage, preemergence stage and ocular stage.
Fertilized eggs should be kept quiet in the first 5 stages of development. The management of hatching should avoid sunlight and mechanical vibrations. Strong light and mechanical vibrations have a lethal effect on fertilized eggs. Scattered light also has adverse effects on the development of eggs. During the incubation period, care should be taken to keep the water flowing, the water quality clean, and no pollution. Two to three times a week to pick eggs, picking eggs to stagger the sensitive period of eggs, to be carried out in running water.
Incubation water requires the clarification of water quality, no impurities and suspended matter, and the water temperature is suitable. The optimum water temperature for hatching is 9~10°C, and the suitable temperature range is 7~13°C. The dissolved oxygen of hatching water should be higher than 6.5 mg/L.
At this time, the management of the ovum is very important, because the ovum consuming more oxygen, even if the water is stopped for a short time, it will be too intensive due to anaerobic suffocation, so during the incubation period must ensure the supply of water, must be shipped with water operating.
Eggs have very weak resistance to light exposure. When bright light is irradiated for several hours, it will be lethal. Therefore, appropriate light protection measures must be taken and the whole process of hatching should be kept quiet to prevent all noise interference and prevent excessive vibration. .
After the rainbow trout fertilized eggs are swollen and swollen, a few days before the oviparous eggs break the membrane, they are counted and put into an incubator for hatching. The incubator can use a hatching tank or hatching tank. Incubation water flows from the lower part through all the eggs and overflows from the upper part. During the entire incubation period, the eggs are kept quiet, and light protection measures are strictly adopted.
Into the eye of the fertilized egg called eye eggs, the temperature accumulated at 220 °C day or so. Embryonic embryos have the lowest sensitivity to external stimuli and are a safe period of development. At this time, long-distance transport can be performed.
When the incubation temperature reaches 220°C or so, when the inside of the egg is relatively clear, the eyeballs in the barrel are poured into the hatching tray in the horizontal groove, and the cover is shading. According to the size of each tank, to maintain a certain amount of water injection, all eggs can be broken in 1 week.
Observe once a day in the morning and evening. Shake the hatching plate gently to squeeze the fry in the lower layer. Adjust the amount of water injected and brush the porous sieve in the hatchery to keep the water flowing and prevent the lack of oxygen and suffocation. When a lot of oil film appeared on the water surface of the hatchery tray, it showed that a large number of seedlings had emerged.
The water injection per 10,000 eggs is 8 to 10 liters per minute. The dead eggs should be removed promptly. When the fish eggs in the hatching tank start to appear broken larvae, inspections should be strengthened to clear the egg skin and dead seedlings. Pay attention to the cleanliness of the feeding environment. Brush the slots frequently to keep the water flowing. The newly hatched larvae have a weak physique, a light body color, a yolk sac, and lying on the bottom of the hatchery tank. The body length is about 15 mm. The nutrition of the yolk sac continues to develop. After 16 to 20 days, the yolk sac gradually absorbs. , Increased surface melanin and increased mobility.
The larvae are known as larvae when they are hatched from the season of the rainbow trout; they are called juveniles when they float up to feed and they are called floating juveniles; they feed about 5 months of age and have a body weight of about 10 grams.
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